I looked up the regulator. One of the few things you can get at RadioShack...
http://www.radioshack.com/product/index.jsp?productId=2062600
It seems that it has internal thermal protection so is it possible it is overheating? I believe the 12V is only used to feed the Arduino. However, if you modded the UM1, did you hook anything else up to the 12V line? Fans? LEDs?
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anon4321 16
Hmmmm, I have seen some behavior similar to this.
If I turn off the power, like in an attempt to abort a print but don't disconnect the USB then reestablish the 19V power, I get the MINTEMP error. Nothing seems to clear it except removing ALL power including the USB power. Even unplugging the USB with the 19V on won't reset it so it appears locked into this state. I believe that without the 19V power, the 5V power "sags" and puts either the Arduino or the TC amp into a weird state.
I think the MINTEMP error really causes a fit in the firmware. I've seen really weird behavior if the machine is started in the MINTEMP state. Like the controller display filling with blocks (try disconnecting the TC from the amp and turning on the machine).
So given all this, is it possible that you are intermittently losing 19V power? Could the jack be "iffy" becoming temporarily disconnected due to vibration? How about the power brick? Is the line side solidly connected?
If it isn't that, you might get the same behavior if the 12V regulator is going bad.
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